/**
 * The workarounds library.
 * More information is available at http://www.jinchess.com/.
 * Copyright (C) 2002 Alexander Maryanovsky.
 * All rights reserved.
 *
 * The workarounds library is free software; you can redistribute
 * it and/or modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * The workarounds library is distributed in the hope that it will
 * be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the workarounds library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package free.workarounds;

import java.awt.event.KeyEvent;
import javax.swing.text.JTextComponent;


/**
 * A class containing various utilities allowing to work around various bugs
 * in Java.
 */

public class FixUtils {


    /**
     * The value of CHAR_UNDEFINED in this JRE. This is needed because
     * its value changed between 1.1 and 1.2. See <A HREF="http://developer.java.sun.com/developer/bugParade/bugs/4106162.html">http://developer.java.sun.com/developer/bugParade/bugs/4106162.html</A> for more information.
     */

    public static final char CHAR_UNDEFINED;


    static {
        try {
            CHAR_UNDEFINED = KeyEvent.class.getField("CHAR_UNDEFINED").getChar(null);
        } catch (IllegalAccessException e) {
            throw new InternalError();
        }
        catch (NoSuchFieldException e) {
            throw new InternalError();
        }
    }


    /**
     * The fake clipboard selection we use when running under MS VM as an applet.
     */

    private static String clipboard = null;


    /**
     * Pastes via the fake clipboard.
     */

    static void fakePaste(JTextComponent tc) {
        String text = tc.getText();
        int caretPos = tc.getCaretPosition();

        tc.setText(text.substring(0, caretPos) + clipboard + text.substring(caretPos));
        tc.setCaretPosition(caretPos + clipboard.length());
    }


    /**
     * Copies via the fake clipboard.
     */

    static void fakeCopy(JTextComponent tc) {
        String selection = tc.getSelectedText();
        if ((selection != null) && (selection.length() > 0))
            clipboard = selection;
    }


    /**
     * Cuts via the fake clipboard.
     */

    static void fakeCut(JTextComponent tc) {
        String selection = tc.getSelectedText();
        if ((selection != null) && (selection.length() > 0)) {
            clipboard = selection;

            String text = tc.getText();
            int selectionStart = tc.getSelectionStart();
            int selectionEnd = tc.getSelectionEnd();

            tc.setText(text.substring(0, selectionStart) + text.substring(selectionEnd));
            tc.setCaretPosition(selectionStart);
        }
    }


}


